Strain-clamp for aerial cables.



1. s. LAPP:

STRAIN CLAMP FOR AERIAL CABLES.

APPLICATION FILED MAR. 24. 1913.

1,268,981 Patented Juno ll, 1918.

2 SHEETSSHEET 7- W 9 1 Q Q1 Elvwvmtoz r 3 w Q/VLH womzo 771M K J. S. LAPP.

STRAIN CLAMP FOR AERIAL CABLES.

APPLICATION men MAR. 24. 1913.

1 268, 981 htentefi June 1918.-

'2 $HEET$--$HEET 2- D 715 J) A 7 71 .9 A

Fain atto'mqay mmnm Jill-IN S. LAIPP, E VICTGE, NEW YORK, AQSIGHOR Till EH33 LGCKE INSULAI'QR, MFG 00.,

' 0}? VIQTGBJ, NEW YQEK, A CQRPOlRtHEKGN 63F "NEW STRAIN-CLAMP F93 AEELQL CABLES.

saw

stringing aerial Wires or cables, and more particularly the high potential cables of electrical transmission systems and it has for its object to provide a simple, strong and efii:

cient strain clamp for joining the successive lengths of cable to the poles or other fixtures from which they are hung. A further object of the invention is to provide a clamp 01 this character that will lenditself to a mode of hoisting and fastening the cable whereby the catenary me be definitely predetermined and the cab e cut to length and fastened While in the position in which it is to remain. To these and other ends the invention consists in certain improvements and combinations of parts all as will be hereinafter more fully described, the novel features being pointed out the claims at the end of the specification.

In the drawings:

Figure 1 is a side elevation of astrain clamp constructed in' accordance with and illustrating one embodiment of my invention;

Fig. 2 is a top plan View; Figs. 3, 4 and 5 are sections taken substantially on the lines 3-3, 4% and 5-5, respectively, of Fig. 1, and

' Figs. 6, 7 and 8 are elevations illustrative of the mode of stringing a cable With the help of my improved strain clamp.

Similar reference numeralsthroughout the several figures indicate the same parts.

' Referring first to Figs. 1 to 5, inclusive, the clamp preferably comprises a body piece or member 1 and a clamping; plate 2, the in nor or adjacent faces of which are recessed in the present instance or provided with longi tudinal recesses or semi-circular grooves 3- constituting a seat Within Which the cable 49.

may be received and clamped by the action of bolts 4: connecting the members. These bolts pass throngh relatively short open- Speciflcetion of Letters iatent. Pggtgggitgd Jung 11, 31915,

Application filed March ca,

1913. Serial No. 7%,569.

ended slots 5 in the plate 2 and relatively long closed slots 6 in the body member so that by merely loosening the bolts and rocking or deflecting them in the long slots 6 they may be temporarily retracted from the open slots 5 to allow the'passage of the cable laterally into or out of its scat between the members Without detaching the bolts.

The bolts are shown disposed in two rows on opposite sides of the seat 3 an, of course, it is only necessary to provide the elongated slots 6 for one set or row as the cable may be always inserted from that side.

At one end the body piece 1 is provided with a yoke 7 and pin 8 or other suitable means of attachment to receive and connect With the eye on the insulator bolt interposed between it and the cross armor other supporting fixture While at the other or outer end it is provided with an eye 9 for hoisting purposes as will be hereinafter explained. This eye 9 preferably has its axis in a horizontal plane with both the seat 3 and the support connection or anchoring attachrnent l it preferably opens vertically and is ofiset from the natural position of the cable A as it leaves the end or lip 10 of the seat 3; it projects outwardly or longitudina'lly beyond the lip 10 and its plane is prefer'ably inclined to the horizontal all for rea sons that will hereinafter appear.

Preferably at the inner end. of the seat 3 and of the clamping plate 2 is a clamping seat 11 (Fig. 3) for the end of a tie piece or section B of the cable which'electrically connects adjacent sections A and which may be secured against its seat by a hook bolt 12 or otherwise. Turning now to Figs, 6, 'i and 8, the former shows a conventional- .form or support ing pole or fixture C from which is suspend ed in finished position two cable sections A. with the aid 8 indicated at 1. The clamps are connected at 7 to the insulators D which are in turn hung at E on the cross arm 13 so as to be interposed between the cable and its support while the tie piece B is strung between the clamps tree of the support.

if course the sag or catenary oi: the cable section A. should, in each instance, be identf cal with that of adjacent sections deter mined icy certain requirements of stress and.

in order gage this it has-hitherto been 11ectssary in most to haul the of two of my strain clamps I the a o ime s, point at which the olzunp slioulo i313; lower the eoblo lilio clamp and thou raise i don god, eonneel; up the, nip to its sop po -flog ZYlGfillJQl. 'lhis ineeliod, aside from the time and labor entailed in noiso be a Lii'LC'lkHi as nearly as 90891- eue it, and

ing the cable more than once unso l: wry owing lo tho foot. *lmt at the time tho cab e is iiitrial posilion ii; is only app ailing ii: permanent oosition and a slight variation in what; es=11mz1tod to bo properlocation of tho chomp may cause even this to vary.

ill the uso of my improved strain slump lino cable is raised only once and thou to a i'tion that is not changed {lining the not of connecting it up lilo-(nigh the medium of tho clamp. To these ends the i is first hung; mm the F with loo 01 A i already fastened thereto at 9 sag VD m Fig. ll The uppoi: olool: G or 1 hooked onto the eye at the imi m: -gi F. 01 a m ,5, bi n1 lfiiwpl woo o use o mo and LN lows -ooi l eu toelied by means of a suitable lemioi'oly clamp J to the continuous length of cable 3i al, a point, I'Ollglllffl beyond the point which it is estimated. that the strain clamp most oi iiCllildu The cable than hoisted shown in 8 to its exact position and it will be noted that as long as the weight thereof is already borne by the strain clamp and insulator D those parts will be straightened out to their norn'iel po sitions as tho tackle, eonsl""'1i1es, in efioot, a confirmation of the ceble d i; is connected i0 tlie eye 9 which, (lesoribod, is in the horizontal plane with and very close to the soul; 3 for the cable. Thereafter it is only nooos ry to out the e lo to suitable length short of lb clamp J1; fasten the free enrl in its soot in tho strain clamp 1 and release the tackle oy 'IGll'lOVlElg tho lBITQQOTZLlIY clamp J and by removing bl 1e hook of: tho block G from the eye oi the strain clamp, whereafter the cable will be in exactly the same position {LS tho strain has simply been tronsieirreil from the eye 9 to the 3 and the only opportunities for variation lie in the once in "posimon Oi the short length of cable ilio ego 1*) is offset and opens vercieally in. order to permit the ready disengagement of sliG hook on lie blof G of the hoisting tackle Without intorfe once on the pail; oi tho cools and i is eye is inclia'iedl o1. tilted iii orrler to bring; longitudinal and hence tho lino oi strain as oloso as possible to the center of tlio ooolo.

l. claim as my invention:

A strain clamp oomprising on anchorii otmai. out, a cable in olinemene therewith, moons fof: clzmiping the cable in the seal: and on eye :ulaptod for the attach. mei'n'; of {L oslolo hoisting (1 ice Jul being; ofise; lalemlly out oi proximity to a sable elmnpod in A sir-51in clamp oompl'i ing an anchor iog yoke having" a transverse "pin, 2% cable seal in olinemom with the yoke and extonri ing; tie isversol oi the pin, and. an. oil's-st eye for ai'melioiont (levies, llie plane of Elie eye being inclined to il'il-i/ plane which is common to the pin and seal, ,ioi' purposes set foith.

A strain clamp comprising a body plate having on anchoring ofiteohmont at one coal in alinel'oent with one face of the plots, :1 cable, clamping plate disposed against said face of the body plate, an offset eye projocting from the opposite face of the body and extending ooyoncl the ands of both plates, and. means for drawing the two together to clamp a cable between tho-m,

4:. in strain clamp, the combination with two parts adopted to form a, cable soot between them, one of said members being provided with a. relatively short open slot and other with a relatively long closed slot extending beyond the open slot, of a boil; for securing the parts together a1- mngeci to pass through both slots and to be displaced from the open one While rocked toward the for and of the closed one to permit the passage of the'ceblo into oncl out oi its is.

JGHN S. LAPPQ EEG cable hoisting 

